820444 has 6 divisors (see below), whose sum is σ = 1435784. Its totient is φ = 410220.

The previous prime is 820441. The next prime is 820459. The reversal of 820444 is 444028.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102552 + ... + 102559.

2⁸²⁰⁴⁴⁴ is an apocalyptic number.

It is an amenable number.

820444 is a deficient number, since it is larger than the sum of its proper divisors (615340).

820444 is a wasteful number, since it uses less digits than its factorization.

820444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205115 (or 205113 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 820444 is about 905.7836386246. The cubic root of 820444 is about 93.6159066642.

The spelling of 820444 in words is "eight hundred twenty thousand, four hundred forty-four".